Extrusion apparatus and methods of extrusion

Details Extrusion apparatus and methods of extrusion Extrusion apparatus and methods of extrusion

1992-09-03

1993-10-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264169, 26421121, 264323, 425197, 4253824, B29C 4770

Patent

active

052502490

ABSTRACT:
Extrusion apparatus and a method of extruding in which an extrusion screw terminates close to a breaker plate so that an annular passage surrounding the screw extends to the breaker plate. The breaker plate has flow apertures arranged around an edge region of the plate for direct communication with the annular passage. The flow passage arrangement decreases in cross-sectional area in a downstream direction whereby plastics materials do not become static in certain regions. Plastics degradation, particularly for PVC, is therefore avoided.

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patent: 4217083 (1980-08-01), Machuque
patent: 4243629 (1981-01-01), Tramezzani
patent: 4318677 (1982-03-01), Ullrich et al.

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